public Mesh(string name, int verticesCount, int facesCount)
{
Vertices = new Vertex[verticesCount];
Faces = new Face[facesCount];
Name = name;
}
public Mesh(Vector3f[] vertices, Vector3f[] normals, int[] triangleIndices)
{
Vertices = new Vertex[vertices.Length];
for (int i = 0; i < vertices.Length; i++)
{
normals[i].Normalize();
Vertices[i] = new Vertex()
{
Coordinates = vertices[i],
Normal = normals[i],
};
}
Faces = new Face[triangleIndices.Length / 3];
int faceIndex = 0;
int triIndex = 0;
Vector3f buff1 = new Vector3f();
Vector3f buff2 = new Vector3f();
while (faceIndex < Faces.Length)
{
Vector3f n = new Vector3f();
// Get a hint for the right directions
Vector3f.AvgAndNorm(
ref normals[triangleIndices[triIndex + 0]],
ref normals[triangleIndices[triIndex + 1]],
ref normals[triangleIndices[triIndex + 2]],
ref n);
// Then compute based on crossing the edges
Vector3f.SubAndNorm(
ref vertices[triangleIndices[triIndex + 0]],
ref vertices[triangleIndices[triIndex + 1]],
ref buff1);
Vector3f.SubAndNorm(
ref vertices[triangleIndices[triIndex + 0]],
ref vertices[triangleIndices[triIndex + 2]],
ref buff2);
Vector3f newN = new Vector3f();
Vector3f.Cross(ref buff1, ref buff2, ref newN);
newN.Normalize();
if (Vector3f.Dot(ref n, ref newN) < 0.0f)
{
newN.X *= -1;
newN.Y *= -1;
newN.Z *= -1;
}
Faces[faceIndex++] = new Face()
{
A = triangleIndices[triIndex++],
B = triangleIndices[triIndex++],
C = triangleIndices[triIndex++],
Normal = newN,
};
}
//var x = Faces
// .Select((p, i) => new[] { new { i, Ind = p.A }, new { i, Ind = p.B }, new { i, Ind = p.C } })
// .SelectMany(p => p)
// .GroupBy(p => p.Ind)
// .Select(p => new { VertInd = p.Key, TriInds = p.Select(q => q.i).ToArray() })
// .ToDictionary(p => p.VertInd, p => p.TriInds);
//foreach (int vertInd in x.Keys)
//{
// Vector3f.AvgAndNorm(x[vertInd].Select(p => Faces[p]).Select(p => p.Normal).ToArray(), ref Vertices[vertInd].Normal);
//}
}
public Mesh(string name, int verticesCount, int faceCount)
{
Vertices = new Vector3[verticesCount];
Faces = new Face[faceCount];
Name = name;
}
public Mesh(int verticesCount, int facesCount)
{
Vertices = new Vertex[verticesCount];
Faces = new Face[facesCount];
}